Duplex valve.



P. W. KNAUF.

Patented Sept. 3, 1918.

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rent w. mveur, or CYNWYI), mmmmlm, assrcnon 'rc SCI-BUTTE & xonnrrne COMPANY, OF PHILADELPHIA, PENNSXLVANIA, A CORPORATTON 0F TENNSYL- VANIA.

DUPLEX VALVE.

ava-ear.

Application filed. March 28, 1918.

To all whom it may concern:

Be it known that I, PAUL W. KNAUF, a citizen of the United States of America, residing in Cynwyd, in the county of Montgomery, in the State of Pennsylvania, have A valve mechanism of this kind is em-' ployed, for instance, on turbine driven ships to control the steam admission to the main and reversing turbines. In such a valve there is a single steam inlet chamber and two outlet chambers connected, one to the steam inlet of the main turbine and the other to the steam inlet of the reversing turbine. In a duplex valve mechanism for such use it is of the highest importance that both outlet chambers should not be in communication with the inlet chamber of the valve at one time.

The general objectof my invention is to provide a unitary duplex valve structure of a type well adapted for the special use referred to, and comprising simple and efiective provisions for positively preventing communication between more than one pair of inlet and outlet chambers at the same time.

The various features of noveltv which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however, and the advantages possessed by it, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and describedpreferred embodiments otmy invention.

' Of the drawings:

Figure 1 is a sectional elevation of a preferred valve mechanism.

Fig. 2 is a sectional plan taken on the line 22 of Fig. 1.

Specification of Letters Patent.

Patented Sept. 3, 19 118.

seriaino. 225,174.

Fig. 3 is a partial sectional plan taken on the line 3-3 of Fig. 1.

Fig 4 is an elevation of the interlocking parts in the position in which one valve is open and the other closed.

Fig. 5 is a view taken similarly to Fig. l but showing the parts in the position in which the valve open in Fig. 4 is closed and the other valve is open.

Fig. 6 is an elevation of a portion of a modified form of valve mechanism, and

Fig. 7 is a plan of the apparatus shown in Fig. 6.

In the drawings, and referring first to the construction shown in Figs. 1 to 5, inclusive,

A represents the casing of aduplex valve adapted for use to control the supply of steam to the main and reversing turbines of a ship. The valve casing is formed with an inlet chamber A connected by two ports at to separate outlet chambers A and A A represents the outlet passage leading from the chamber A and intended for con nection to one of the turbines, say, the main turbine. A represents the outlet port from the outlet chamber A* intended to be con nected to the inlet of the reversing turbine.

Communication through the port A? connectingchambers A and A is controlled by a valve member D, which, in the form shown, comprises a valve seat engaging portion and a balancing piston l) connected thereto by a sleeve or stem portion, and working in the piston chamber A. formed in thevalve casing at the opposite side of the chamber A from the port A The valve stem D passes through, but does not fill the sleeve connecting the balancing piston D to the valve disk portion proper of the valvemember D. At its upper end the stem D carries a pilot valve D which controls communication through the hollow stem portion of the valve between the inlet chamber A and the remote end of the cylinder space A The pilot valve D also forms a piston or crosshead permitted a re- .stricted axial movement between the body of the valve member D and the retaining cage portion. In operation the initial opening movement of the valve stem D unseats the pilot valve D and thus places the remote end of the chamber A in communication With the chamber A, and thereby balances,

or substantially balances, the steam pressures acting on the valve member D. The valve balancin andoperating PIOVlSlODS so far describ are not in themselves novel with me. The means for controlling communication between the inlet chamber A and the second outlet chamber A, as shown, are identical with those controllingcommunication between the chambers A and A, and corresponding ports in the two port controlling mechanisms are designated by similar upper and lower case symbols and exponents.

The valve stem D is connected by a link D and one arm of an interlocking member F to a rock shaft D on which the element F is secured. Similarly the valve stem (1 is connected by interlocking element G to the rock shaft (i on which the element G is secured. To one end of the rock shaft D is secured an operating lever D which is shownas provided with a locking bolt D working over a toothed segment E. Similarly, the rock shaft d has secured to it at one end an operating lever (Z provided with a locking bolt d adapted to engage with the teeth of a second locking segment E. The rock shafts D d are journaled in, and the two segments E are carried by, a bracket A secured to the valve body and shown as provided with sliding bearings for the adjacent ends of the valve spindles D and (i The interlocking element F 'comprises an interlocking surface F in the form of a. segment of a cylinder coaxial with the rock shaft D and an intersecting interlocking surface F coincident with a segment of a cylinder which is coaxial with the shaft (Z when the valve D is in the closed position shown in Fig. 1. Similarly, the interlocking element G comprises an interlocking surface G .in the form of a segment'of a cylinder coaxial with the shaft cl, and an intersecting'interlocking surface G which coincides with a segment of a cylinder coaxial with the shaft (1 when the valve member (1 is in the closed position as shown in Fig. 1.

With both valve members closed, as shown in Fig. 1, either valve members D or 0! may be opened by turning the corresponding operating lever D and d, but with the two valves cannot be simultaneously opened and as soon as either valve is opened the other is, positively locked in the closed position by'the interengagementof the interlocking elements F and G until the open valve is returned to its closed position. The

interaction between the interlocking elements is'readily apparent from Figs. 1, 4

r and 5. In Fig. 4 the interlocking elements are in the position occupied by them when the valve D is open and the valve (Z is closed. In this condition .of the apparatus the surface F of the element F engages a link (i and one arm of an the surface D of the element G. The element G does not interfere with the turning movement of the element F and in consequence the valve D can be opened wide or closed tight, or set in any intermediate position as is desired. So long, however, as the valve D is out of the closed position the engagement existing between the surfaces F and G prevent the valve member d from being moved out of its closed position. Fig. 5 corresponds to the open position of the valve member (land in this condition of the apparatus the adjustment of the valve member (I is not interfered with, but the engagement between the surface F of the member F and the surface G of the member G prevents the valve member D from being moved out of its closed position.

In the modification illustrated in Figs. 6 and 7, the valve body A, and interior parts, may be identical with those of the valve construction illustrated in Fig. 1. In Figs. 6 and 7 the bracket A secured to the valve body A, and on which the valve operating levers are mounted, has journaled in its two valve operating rock shafts D and 01, which are in alinement with each other. The valve lever D for operating the valve spindle D is secured to the rock shaft 1), and the latter is provided with an arm D connected to the valve spindle D by links D The rock shaft D is also provided with an arm D 'by a link D to an arm H carried by a rock shaft H parallel t0 the shafts D and and journaled in the bracket A The rock shaft H carries a cam interlocking element FA, which may be substantially identical with the interlocking element F of the construction shown in Fig. 1.

The interlocking element FA cooperates with an interlocking element GA substantially similar to the interlocking element G of the construction first described. The interlocking element GA is secured to the rock shaft cl, to which is also secured the operating. lever cl for operating the valve spindle (i The rock shaft (Z has an arm d connected to the valve spindle (l by links (Z Associated with the valve levers D and (Z are toothed locking segments EA and ea respectively.

The general operation of the modified form of valve mechanism, shown in Figs. 6 and 7, is essentially the same as that of the construction shown in Fig. 1, as will be apparent Without further explanation. The valve mechanism shown in Figs. 6 and 7 possess an advantage over that shown in Fig. 1, however, in that the valve levers D and d are arranged side by side to turn about the same axis, and are moved in the same directions to produce corresponding opening and closing movements arvae"? of the two valves. These advantages are of considerable practical importance. The practical use of the form of my invention, shown in Fig. 1, has shown that undesirable confusion may result from an arrangement in which one'valve lever is moved in one direction to open the valve connected thereto, while the valve lever alongside of it is moved in the opposite direction to ope the valve connected thereto.

ll hile in accordance with the provisions of the statutes I have illustrated and described the best form of my invention now known to me those skilled in the art will understand that changes may be made in the form of the apparatus disclosed without departing from the spirit of my invention as set forth in the annexed claims.

Having now described my invention, what I claim as new and desire-to secure by Letters Patent, is:

1. A unitary duplex valve mechanism comprising a valve body formed with two outlets, a separate balanced valve mechanism controlling each outlet and each com prising a valve proper, a valve spindle extending through the wall of the valve body and parallel to the other valve spindle, connected to said valve for positive actuation of the latter in each direction, hand levers for actuating each valve spindle independently of the other and interlocking provisions actuated by the turning of said levers whereby each valve spindle is held in the closed'position While the other is in an open position. i

2. A duplex valve mechanism comprising a valve body formed with two ports, separate valve mechanisms controlling said ports and each comprising a valve proper, a valve spindle extending through the wall of the valve body connected to said valve for positive actuation of the latter in each direction, a separate actuating hand lever for and connected to each valve spindle, and cam means cooperating with said levers to prevent either from being turned out of the position in which the corresponding valve is closed when the other lever is in the position in which the valve connected to it is open.

3. A duplex valve mechanism comprising a valve body formed with two ports, separate valve mechanism controlling said ports and each comprising a valve proper, a valve spindle extending through the wall of the valve body connected to said valve for positive actuation of the latter in each direction, a separate actuating hand lever for and connected to each valve spindle,

said amid levers being arranged side by side and being adapted to open the valves connected thereto when turned in one direction and to close the valves when turned in the opposite direction, a cam interlocking element connected to and oscillating with one of said levers, and a second cam interlocking element connected to the second of said levers to oscillate simultaneously therewith but in an opposite direction, said cam means cooperating to prevent either lever from being turned out of position in which the corresponding valve is closed when the other lever is in the position in which the valve connected to it is open.

l. A duplex valve mechanism comprising a valve body formed with two ports, separate valve mechanisms controlling said ports and each comprising a valve proper, a valve spindle extending through the wall of the valve body connected to said valve for positive actuation of the latter in each direction, a separate actuating hand lever for and connected to each valve spindle, a cam interlocking element rigidly connected to and oscillating with one of said levers, a

second cam interlocking element geared to the second of said levers to oscillate simul-- taneously therewith but in an opposite direction, said ,cam means, cooperating to prevent either lever from being turned out of position in which the corresponding valve is closed when the other lever is in the position in which the valve connected to it is open.

5; A duplex valve mechanism comprising a valve body formed with two ports, separate valve mechanisms controlling said ports and each comprising a valve proper, a valve spindle extending through the. wall of the valve body connected to said valve for positive actuation of the latter in each direction, and a rock shaft geared to said spindle and provided with an operating lever arm, the two valve spindles being arranged side by sideand the two rock shafts being coaxial, a cam interlocking element rigidly connected to one of said rock shafts, a counter shaft parallel to said rock shafts and gear connected to the other of said levers, and a cam interlocking element secured to said counter shaft and cooperating with the first mentioned interlocking element to prevent either valve lever from being turned out of the position in which the corresponding valve is closed when the other lever is in the position in which the valve connected to it is open.

PAUL W. KNAUF. 

